Quote:
Originally Posted by eoym
Ok, I looked up the specs on an AB800 and found that the flash duration is 1/3200th of a second. Any shutter speed setting slower then that will have ZERO effect on the exposure this flash is providing.
Changing shutter speeds will ONLY effect how much ambient light records.
For the sake of agument, let's say there was no ambient light at all, completely dark studio, you could set your shutter speed at anything less the 1/3200th of a second and there would be NO difference in exposure. Hell, you could leave the shutter open and go take a lunch break!
:-)
The exposure was made, and completed, at 1/3200th of a second. And in a dark studio....there is no more, or no less, light left after that.....it's done.
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Not quite right! At any shutter speed SLOWER THAN THE SYNC SPEED, sure, no problem. If you are at 1/2000 second (faster than the sync speed of any camera I know) then you will see a difference - there will be a brightly lit bar on the image, and the rest will be black. The reason is that the sync speed of the camera is the fastest shutter speed at which the sensor (or film) is completely exposed. Anything faster, and the shutter curtains both move at the same time (the distance between them controls the shutter speed). The bright bar will be the portion of the sensor which was uncovered when the flash went off.
BTW: I have trouble believing that the ABs are 1/3200 second - that's extremely fast. I suspect that they are rather slower than that - more like 1/700-1/1500.